Mr. Cook gave a history quiz last week. The scores from his class are shown below. 78, 82, 91, 75, 76, 86, 90, 88, 70, 72 A student was absent on the day of the quiz and scored a 50 on the make-up quiz. What is the approximate difference in the class' mean score before and after the make-up quiz? A 3 points B. 4 points c. 5 points D 6 noints